Army & Navy - NAVY: Black Sailors

The leader, in this queer obstacle race, was a
big black fellow, knotty of muscle, sleek of thigh. He leaped a
seven-foot wall, writhed easily hand-over-hand up a rope, scrambled
over a log breastwork, pawed up one side of a big rope web and down the
other, snaked through a culvert pipe and broad-jumped a trench.

The big fellow stopped, wheeled around to see how the others were coming
along. A chief petty officer yelled, "Keep going!" He kept going. So
did the men behind him. They went like mad, clear to the end of the
"Commando" physical-training course.